# Do ideas arise twice?

**Do the same ideas appear separately in different places?**

Calculus came to Newton and Leibniz independently, and writing seems to have started in more than one region. Telling invention twice from travel is a question about how ideas move.

Connects to:
- [Routes and exchange](https://mapideas.org/i/hi_routes)
- [How numbers travelled](https://mapideas.org/i/hi_numbers)

Sources:
- [Wikipedia: Multiple discovery](https://en.wikipedia.org/wiki/Multiple_discovery)

Source: https://mapideas.org/i/q_hist_twice · open on the map: https://mapideas.org/#q_hist_twice